Sixteen-year-old Janelle never thought the gray spiral birthmark on her arm meant anything special. That is, until she meets Gary, a boy her age with a birthmark exactly like hers. Gary’s attractive, brooding, and perfectly normal…except for the fact that he materialized out of a dangerous hurricane right in front of her. Janelle’s certain of only one thing. Gary’s mark—and hers, too—mean something, but he’s reluctant to tell her what. At last she squeezes the truth from Gary about their markings. And the truth is utterly terrifying: Janelle and Gary are more connected to the destructive power of nature than she ever dreamed possible. And learning the truth about herself is only the start of her nightmare.